(e) No person entitled to use the water of any canal, or any work, building or land or appertaining to any canal, shall sell or sub-let or otherwise transfer his right to such use without the permission of the canal-officer, but all contracts made between Government and the owner or occupier of any immovable property, as to the supply of canal-water to such property, shall be transferable therewith, and shall be presumed to have been so transferred whenever a transfer of such property takes place.